Experimental Research On Flocculation-adsorption Treatment And Reuse Of Lead-zinc Beneficiation Wastewater

Non-ferrous metal ore beneficiation wastewater are excessively severe with lots of harmful substance.Solid suspension,heavy metal ions and COD_Cr are severely higher than the Emission standard of pollutants for Industrial.The wastewater without being treated can seriously pollute the natural water,mining environment,even threat human health,when it is returned to the use of the process will cause serious economic losses to the mine.Therefore,the treatment of beneficiation wastewater is imperative,and it is also make an important impact to the sustainable development of mines.The paper studies onthe purification treatment for lead-zinc ore beneficiation wastewater,by carrying out the impact onlead-zinc concentrate index withreusing those untreatedbeneficiation wastewater directly,the impact on lead-zinc concentrate index with reusing the simulated wastewater insingle factor,the influencing factors for the flocculation-adsorption purification treat the wastewater.Eventually,effective and environmentally-friendly carboxymethyl chitosan and activated carbon were used to treat the actual beneficiation wastewater and achieve efficient reuse of mine wastewater.The test of untreated wastewater reuse in flotation directly and simulated wastewater single-factor reuse flotationshow that the beneficiation wastewater from each branch of lead-zinc ore flotation had a significant impact on the lead-zinc concentrate index,and the total tailings water affected the flotation seriously than concentrates.When the waste water is reusing directly,the main factors influencing the quality of lead-zinc crude concentrate products are the residual Pb²⁺,Zn²⁺,and Cu²⁺ions in the waste water,and organic reagents ethyl sulfur and butyl xanthates,especially metal ions in the waste water,at low concentrations.The lead-zinc exchange rate of concentrate products will become higher and the main metal grade and recovery rate will decrease.The test of simulation wastewater flocculation purification,mainly investigated those factors that pH,flocculant dosage,flocculation reaction time and coagulant PAM dosage how to influence the flocculation purification effect,the results show that the flocculation method can only remove the metal ions but have no effect to COD_Crr degradation;the optimal pH of each flocculant is different,but overall it shows good flocculation effect under neutral conditions;when the flocculant dosage and time are the same,it is found that The removal effect of metal ions by the three kinds of flocculants was:carboxymethyl chitosan was better than PAC and PAC was better than PFS.The test of simulation wastewateradsorption purification,mainly investigated those factors that pH,the activated carbondosage,adsorption reaction time how to influence the effect of activated carbon adsorption COD_Cr,the results show that activated carbon in the weak acid and neutral environment showed good ability in adsorption,increasing activated carbon dosage and the prolongation of adsorption reaction time,the adsorption effect of powdered activated carbon and granular activated carbon is getting closer,and as long as the amount of activated carbon is sufficient and the adsorption reaction time is long enough,the COD_Cr in the wastewater can be basically removed by 100%.The actual beneficiation wastewater treatment and reusing test study shows that the carboxymethyl chitosan flocculation+activated carbon adsorption treatment process can be a good treatment of lead zinc sulfide mineral processing wastewater,the best treatment conditions are:carboxymethyl chitosan 30mg/L+polyacrylamide5mg/L?reacting120min?+activated carbon 130mg/L?reacting 60min?,the final wastewater Pb²⁺can be removed 92.26%,Zn²⁺can be removed 89.27%,and the removal rate of Cu²⁺is 90.41%.,COD_Crr adsorption rate of 63.74%,water quality indicators are good,and the treated water can be recycled 100%and does not affect the flotation concentrate index.